CVE-2025-55640

State: Published
Severity: 5.5 Medium
Published: Oct 16, 2026
Updated: Oct 26, 2026
Reserved: Aug 13, 2025

Description

A heap buffer overflow in the stbl_AddSize function (isomedia/stbl_write.c) of GPAC MP4Box v2.4 allows attackers to cause a Denial of Service (DoS) via supplying a crafted MP4 file.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
n/an/a	n/aAffected

References

https://github.com/gpac/gpac/issues/3261
https://github.com/sigdevel/pocs/blob/main/res/gpac/MP4Box/25/25_poc.mp4
https://github.com/gpac/gpac/commit/321624f28d19a413449fd1718d1eb59037f8f7fc
https://infosec.exchange/@sigdevel/116769271709415444
http://www.openwall.com/lists/oss-security/2026/10/17/2

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